Mathias theisen



M. THEISEN.

BOLT AND RIVET TRIMMER.

No.. 104,509. Patented June 21, 1870.

tetra figment @tlllira Mn'rHIAs THEISEMOF ,WAUKON, IOWA-.-

Letters Patent No. 104,509, dated June 21, 1870,

p i W nvrrnqvsn non-r AND River-TRIMMER The-Schedule referred to inthese Letters Patent and linking part of the same To all whom it may concern:

Be'it known that I, MATIIIAS Tnnrsnn, of Wankon, in the county of Allamakee and State of Iowa,

have invented a new and useful Improvementin Bolt and Rivet-Trimmers; and I do herebydeclare the following to be a full, .clear, and-exact description thereoflwhich will enable othersskilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying drawing forming part of this specification:

Figure 1 is aside elevation of my improved bolt and rivet-trimmer. I v I Figure 2 is a transverse section of the same in the plane of the line a; z, fig. 1.

"Similar letters of reference indicate corresponding parts in the several figures of the drawing.

My invention has for its object to provide an improved device for cutting ortrimming bolts and rivets.

and, to this end,

It consists'in the combination of parts, as will'be hereinafter more fully described.

.In the accompanying drawing- A is-the jaw and handle, carrying the cutters, provided,npon one side, with the lateral arm B, to which the operating-leveror handle, 0, is pivoted.

D is a short lever, of' the first order, with its l'nlcrum in the short projection, E, extending from the lower side of th e'arm B, as shown in fig. l.

The longer arm of this lever is connectedto the lever-handlc 0, near thefulcrnm .E of the latter, -.by means of a pivoted link or li'i1ks,-F,, and its shorter arm is-connected by a similar link, G, to a chisel, H,

. This arrangement is of arranged at right angles to the-arm B, as shown in fig; 1'. v i I By this arrangement a compound lever is formedof great power to operate the cuttmg-ch1seL J is an extension, formed upon the front end of the handle, and'slotted, for the reception of the chisel;

At the outer end of the ,slot the extension is hereled inward to form a fixed cutter, in, between which and the edge of the cbiselthe bolts and rivets are placed to, he cut or trimmed, as will be readily understood.

The chisel is guidedin'it s movements by means of loops or hands secured to thehack of the extension,

as shown in fig. f2;

By extending the part ,J, together with the chisel,

I the device may be applied to cutting the heads oi rivets in smallpipesorboiler-flnes., I

special advantage,- inasmuehas the extension, being, the only port-ion of the tool inserted within the pipe, 'ean----be made ofisucli 

